The create_worker_block
operation allows you to prevent a Worker from working on your HITs. For example, you can block a Worker who is producing poor quality work. You can block up to 100,000 Workers.
See https://www.paws-r-sdk.com/docs/mturk_create_worker_block/ for full documentation.
mturk_create_worker_block(WorkerId, Reason)
[required] The ID of the Worker to block.
[required] A message explaining the reason for blocking the Worker. This parameter enables you to keep track of your Workers. The Worker does not see this message.